From these three undefined terms, all other terms in Geometry can be defined. In Geometry, we define a point as a location and no size. A line is defined as something that extends infinitely in either direction but has no width and is one dimensional while a plane extends infinitely in two dimensions.
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The same reason 6 is more than 5, but less than 7. Since they are all divided by 8, the order still works.
It is 2,500 grams because one kilogram equals to 1,000 grams
No because the number has to be between 1 and 10 so it should be 2.6x10^3
